F3C993B5-1415-4F0F-B0E3-451AC2589D81.png

1 獲取當(dāng)前時(shí)間 和目標(biāo)時(shí)間 計(jì)算相差多少
2 使用gcd 獲取倒計(jì)時(shí)
3 屬性字符串 設(shè)置 時(shí)分秒 的字體和背景色

{
    dispatch_source_t  _timer;
}

        NSString *deadlineStr = self.model.auction.endTime;
                
                NSString *nowStr = [NSString getCurrentTimeyyyymmdd];
                NSInteger secondsCountDown = [NSString getDateDifferenceWithNowDateStr:nowStr deadlineStr:deadlineStr];
                [self setdata:secondsCountDown];

- (void)setdata:(NSInteger)secondsCountDown{
    __weak __typeof(self) weakSelf = self;
    
    if (_timer == nil) {
        __block NSInteger timeout = secondsCountDown; // 倒計(jì)時(shí)時(shí)間
        
        if (timeout!=0) {
            dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
            _timer  = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
            dispatch_source_set_timer(_timer, dispatch_walltime(NULL, 0), 1.0*NSEC_PER_SEC,  0); //每秒執(zhí)行
            dispatch_source_set_event_handler(_timer, ^{
                if(timeout <= 0){ //  當(dāng)?shù)褂?jì)時(shí)結(jié)束時(shí)做需要的操作: 關(guān)閉 活動(dòng)到期不能提交
                    dispatch_source_cancel(self->_timer);
                    self->_timer = nil;
                    dispatch_async(dispatch_get_main_queue(), ^{
//                        weakSelf.timeLabel.text = @"當(dāng)前活動(dòng)已結(jié)束";
                        weakSelf.headerView.titleLabel.text = @"已結(jié)束";
                    });
                } else { // 倒計(jì)時(shí)重新計(jì)算 時(shí)/分/秒
                    NSInteger days = (int)(timeout/(3600*24));
                    NSInteger hours = (int)((timeout-days*24*3600)/3600);
                    NSInteger minute = (int)(timeout-days*24*3600-hours*3600)/60;
                    NSInteger second = timeout - days*24*3600 - hours*3600 - minute*60;
                    NSString *strTime = [NSString stringWithFormat:@"距結(jié)束還有: %02ld 時(shí) %02ld 分 %02ld 秒",hours, minute,second];
                    dispatch_async(dispatch_get_main_queue(), ^{
                        if (days == 0) {

//                          weakSelf.headerView.titleLabel.text = strTime;
                            
                            NSString *endstr =  strTime;
                                                    NSMutableAttributedString *mutablestr = [[NSMutableAttributedString alloc]initWithString:endstr];
                                                    NSDictionary *attris = @{NSForegroundColorAttributeName:[UIColor whiteColor],NSBackgroundColorAttributeName: ZHColor(140, 190, 250, 1),NSForegroundColorAttributeName:[UIColor whiteColor]};
                                                       [mutablestr setAttributes:attris range:NSMakeRange(7,2)];
                                                      [mutablestr setAttributes:attris range:NSMakeRange(12,2)];
                                                      [mutablestr setAttributes:attris range:NSMakeRange(17,2)];
                                                    weakSelf.headerView.titleLabel.attributedText = mutablestr;
                            
                        } else {

                            NSString *endstr =  [NSString stringWithFormat:@"距結(jié)束還有: %ld 天 %02ld 時(shí) %02ld 分 ",days,hours, minute];
                            NSMutableAttributedString *mutablestr = [[NSMutableAttributedString alloc]initWithString:endstr];
                            NSDictionary *attris = @{NSForegroundColorAttributeName:[UIColor whiteColor],NSBackgroundColorAttributeName: ZHColor(140, 190, 250, 1),NSForegroundColorAttributeName:[UIColor whiteColor]};
                               [mutablestr setAttributes:attris range:NSMakeRange(7,2)];
                              [mutablestr setAttributes:attris range:NSMakeRange(12,2)];
                              [mutablestr setAttributes:attris range:NSMakeRange(17,2)];
                            weakSelf.headerView.titleLabel.attributedText = mutablestr;
                        }
                        
                    });
                    timeout--; // 遞減 倒計(jì)時(shí)-1(總時(shí)間以秒來計(jì)算)
                }
            });
            dispatch_resume(_timer);
        }
    }
  
}